The Taunt Heard Round the World - S1.E31

Kilokahn no longer wants Malcolm's help in making viruses, so he turns to the first computer user he can find, which is Sydney. He gets her to create her own virus for Servo to fight. After a bit of confusion, it seemed as if the virus would not cause any harm after all, that is until Malcolm turns the virus fully evil. Sydney, feeling responsible, aids Servo in defeating the virus by piloting the Drago system in order to create Phormo.